<template>
	<view>
		<view class="search-box">
			<uni-search-bar placeholder="请输入搜索内容" @input="input" :radius="100" 
			cancelButton="none"></uni-search-bar>
		</view>
		<!--搜索建议列表-->
		<view class="sugg-list" v-if="searchResults.length!==0">
			<view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDeatail(item)">
				<view class="goods-name">{{item.goods_name}}</view>
					<uni-icons type="arrowright" size="16"></uni-icons>
				</view>
		</view>
		
		<!--搜索历史-->
		<view class="history-box" v-else>
			<!--标题区域-->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="17" @click="clean"></uni-icons>
			</view>
			<!--列表区域-->
			<view class="history-list">
				<uni-tag class="uni-tag" :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				//延时器的timerId
				timer:null,
				//搜索关键词
				kw: '',
				//搜索的结果列表
				searchResults:[],
				//搜索历史的数组
				historyList:[]
			};
		},
		onLoad(){
			this.historyList=JSON.parse(uni.getStorageSync('kw')||'[]')
		},
		methods:{
			//input输入事件的函数
			input(e){
				//清除timer对应的延时器
				clearTimeout(this.timer)
				//重新启动一个延时器，并把timerId赋值给this.timer
				this.timer=setTimeout(()=>{
					this.kw=e.valueOf()
					this.getSearchList()
				},500)
			},
			async getSearchList(){
				if(this.kw.length===0){
					this.searchResults=[]
					return
				}
				//query表示要填的值类似于localhost:8080/stu?query=this.kw
				const {data:res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
				if(res.meta.status!==200) return uni.$showMsg()
				this.searchResults=res.message
				
				this.saveSearchHistory()
			},
			gotoDeatail(item){
				console.log(item)
				uni.navigateTo({
					url:'/subpkg/goods_detail/goods_detail?goods_id='+item.goods_id
				})
			},
			saveSearchHistory(){
				//把搜索结果push到数组中
				//this.historyList.push(this.kw)
				
				//将Array数组转换为set对象
				const set=new Set(this.historyList)
				//删除输入的值
				set.delete(this.kw)
				//重新增加值
				set.add(this.kw)
				//将set对象转换为Array数组
				this.historyList=Array.from(set)
				
				//对搜索历史，进行持久化的存储
				uni.setStorageSync('kw',JSON.stringify(this.historyList))
			},
			clean(){
				this.historyList=[]
				uni.setStorageSync('kw','[]')
			},
			gotoGoodsList(kw){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?query='+kw
				})
			}
		},
		computed:{
			histories(){
				//将数组的数据倒转
				return [...this.historyList].reverse()
			}
		}
	}
</script>

<style lang="scss">
.search-box{
	padding: sticky;
	top: 0;
	z-index: 999;
}
.sugg-list{
	padding: 0 5px;
	.sugg-item{
		display: flex;
		align-items: center;
		justify-content: space-between;
		font-size: 12px;
		padding: 13px 0;
		border-bottom: 1px solid #efefef;
		.goods-name{
			//文本不允许换行（单行文字）
			white-space: nowrap;
			//溢出部分隐藏
			overflow: hidden;
			//溢出部分隐藏后，使用...代替
			text-overflow: ellipsis;
			margin-right: 3px;
		}
	}
}
.history-box{
	padding: 0 5px;
	.history-title{
		display: flex;
		justify-content: space-between;
		height: 40px;
		align-items: center;
		font-size: 13px;
		border-bottom: 1px solid #efefef;
	}
	.history-list{
		display: flex;
		flex-wrap: wrap;
		
		.uni-tag{
			margin-top: 10px;
			margin-right: 5px;
		}
	}
}
</style>
